2 of which I have myself - the 16-35 and the 70-200 both f/4 (which are lighter to carry than their f/2.8 siblings) and I love the both! In between those 2 I use my secondhand bought Tamron 24-70mm f/2.8 which is not too bad in sharpness - but it's not a Nikon!!
Why so high ISO?
25.600 seems a bit "overkill"? Don't get me wrong - one cannot see too much noise in the low-light area, but 6.400 would not have done the trick, with stationary objects ...?
Best regards,
Walter